[MPlayer-users] How to fit video, in mplayer, to full screen keeping aspect ratio and adding the black bars - without stretching

[film123 at gmail.com]

Hello.
Anyone know the command line to play a video in mplayer so that it fits the
full screen (16:9) and automatically adds black bars top and bottom if
required or right and left side if required.
What I do now is add padding to each frame with  ffmpeg.
Thanks, Barry